Eclectic Twyla Tharp, celebrating five decades of dance-making in 2015, is an “outsider” for her ability to range from post-modern experiment to Hollywood’s pop flavours (see for example her choreographies for Milos Forman’s Hair), and her ease with both neo-classical dancers as Baryshnikov and contemporary groups. Her omnivorous curiosity about dance is unveiled in tonight’s threefold bill. On the one hand are the remote Country Dances (1976), tasting like rural America; on the other are the dizzying virtuosity of Brahms’s Variations on a Theme by Paganini. Finally, a peek at Tharp’s nearest future with a new work, Beethoven Opus 130, created for one of her longtime dancers, Matthew Dibble.